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What is Z in the above sequence of react...

What is Z in the above sequence of reactions

A

B

C

D

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D
Oxidation and subsequent hydrolysis with acid gives pheol (X) and propanone which then undergoes Kolbe.s reaction with NaOH and `CO_(2)` to give salicyclic acid (Y) . Then Y undergoes acetylation to give aspirin (Z) . The reaction is as follows :


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